Aquatop PFE-1 Power FilterAquatop PFE Power Filters provide 3 stage filtration for small aquariums to keep the water just as clear and healthy as in a large tank. The PFE filter features a convenient hang on tank design and includes replaceable filter sponge cartridges, activated carbon, and bio media for mechanical, chemical, and biological filtration. 3 stage filtration for small aquariums Removes floating debris and waste products Mechanical, chemical, and biological media